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Usage Patterns of an Online Search System.
Peer reviewed Peer reviewed
Cooper, Michael D. – Journal of the American Society for Information Science, 1983
Examines usage patterns of ELHILL retrieval program of National Library of Medicine's MEDLARS system. Based on sample of 6,759 searches, the study analyzes frequency of various commands, classifies messages issued by system, and investigates searcher error rates. Suggestions for redesigning program and query language are noted. Seven references…
Descriptors: Computer Programs, Databases, Information Retrieval, Information Systems
Failure Time Analysis of Office System Use.
Peer reviewed Peer reviewed
Cooper, Michael D. – Journal of the American Society for Information Science, 1991
Develops mathematical models to characterize the probability of continued use of an integrated office automation system and tests these models on longitudinal data collected from 210 individuals using the IBM Professional Office System (PROFS) at the University of California at Berkeley. Analyses using survival functions and proportional hazard…
Descriptors: Adoption (Ideas), Information Systems, Longitudinal Studies, Mathematical Models
Analytical Models for Library Planning
Peer reviewed Peer reviewed
Leimkuhler, Ferdinand F.; Cooper, Michael D. – Journal of the American Society for Information Science, 1971
Operations Research models of the acquisition and storage functions of a library are developed. Rules for selection of materials for a depository are analyzed and models of circulation interference and usage are explored. A generalized model of library costs and benefits is proposed. (11 references) (Author)
Descriptors: Cost Effectiveness, Library Acquisition, Library Circulation, Library Collections
Stochastic Modeling of Usage Patterns in a Web-Based Information System.
Peer reviewed Peer reviewed
Chen, Hui-Min; Cooper, Michael D. – Journal of the American Society for Information Science and Technology, 2002
Uses continuous-time stochastic models, mainly based on semi-Markov chains, to derive user state transition patterns, both in rates and in probabilities, in a Web-based information system. Describes search sessions from transaction logs of the University of California's MELVYL library catalog system and discusses sequential dependency. (Author/LRW)
Descriptors: Academic Libraries, Higher Education, Library Catalogs, Markov Processes
Using Clustering Techniques To Detect Usage Patterns in a Web-based Information System.
Peer reviewed Peer reviewed
Chen, Hui-Min; Cooper, Michael D. – Journal of the American Society for Information Science and Technology, 2001
This study developed an analytical approach to detecting groups with homogenous usage patterns in a Web-based information system. Principal component analysis was used for data reduction, cluster analysis for categorizing usage into groups. The methodology was demonstrated and tested using two independent samples of user sessions from the…
Descriptors: Data Analysis, Information Systems, Library Catalogs, Online Catalogs
Using Article Photocopy Data in Bibliographic Models for Journal Collection Management.
Peer reviewed Peer reviewed
Cooper, Michael D.; McGregor, George F. – Library Quarterly, 1994
Describes a method of cost-per-use analysis for individual journal articles to facilitate journal selection, deselection, and retention decisions. Conducted in a biotechnology library, the study was based on 491 users who requested more than 48,000 article photocopies over 3 years. Information on user behavior and journal use patterns is provided.…
Descriptors: Bibliometrics, Biotechnology, Comparative Analysis, Corporate Libraries